import Vue from 'vue'
import VueRouter from 'vue-router'
import  Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import User from '../components/user/User.vue'
Vue.use(VueRouter)

const routes = [
  {path:'/',redirect:'login'},
  { path: '/login',component: Login},
  {
    path:'/home',
    component: Home,
    redirect:'/welcome',
    children:[
      { path:'/welcome',component:Welcome},
      { path:'/users',component:User}
    ]
  },
]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫
router.beforeEach((to,from,next)=>{
//to 将要访问的路径
// 代表从哪个路径跳过来
// next（）放行  next('/login') 强制跳转
    if(to.path=='/login') return next()
    const tokenStr=window.sessionStorage.getItem('token')
    if(!tokenStr) return next('/login')
    next()

})

export default router
